Yes

you do need a jacket based on the weather in Elgin, IL, USA 1 second ago

Why? Because there are strong winds blowing out there!
61°F16°C & Windy

Wind is 16 mph26 km/h from the West, gusting to 29 mph47 km/h
September 5
12pm62°F16°C17 mph27 km/h WestWindy
1pm63°F17°C17 mph27 km/h WestWindy
2pm64°F18°C16 mph26 km/h WestWindy
3pm65°F18°C16 mph26 km/h WestWindy
4pm66°F19°C16 mph25 km/h WestWindy
5pm66°F19°C15 mph24 km/h WestMostly Clear
6pm66°F19°C13 mph22 km/h WestMostly Clear
7pm63°F17°C11 mph18 km/h WestMostly Clear
8pm60°F16°C9 mph14 km/h WestMostly Cloudy
9pm58°F14°C7 mph12 km/h WestMostly Cloudy
10pm56°F13°C7 mph11 km/h WestMostly Cloudy
11pm54°F12°C6 mph10 km/h WestMostly Cloudy
DateLowHighWindDayNight
September 551°F11°C66°F19°C14 mph23 km/h from WestMostly ClearPartly Cloudy
September 647°F8°C64°F18°C10 mph16 km/h from WestPartly CloudyMostly Clear
September 745°F7°C66°F19°C8 mph13 km/h from NorthwestMostly ClearClear
September 847°F8°C71°F22°C7 mph11 km/h from SouthMostly ClearPartly Cloudy
September 954°F12°C75°F24°C10 mph16 km/h from SouthPartly CloudyPartly Cloudy
September 1056°F13°C79°F26°C5 mph8 km/h from WestPartly CloudyPartly Cloudy
September 1160°F15°C74°F23°C9 mph14 km/h from NortheastMostly CloudyMostly Clear

Yes

Low of 47°F9°C, High of 64°F18°C
Wind: 10 mph16 km/h
Precipitation: None

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